package cn.paper.impl;

import cn.paper.Paper;

public class TestPaper implements Paper {
    //每行字符数
    private int charPerLine=16;
    //每页行数
    private int linePerPage=5;
    //纸张中内容
    private String content="";
    //当前横向位置，从0到charPerLine-1
    private int posX=0;
    //当前行数，从0到linePerPage-1
    private int posY=0;
    //当前页数
    private int posP=1;
    //用于注入每行的字符数
    public void setCharPerLine(int charPerLine) {
        this.charPerLine = charPerLine;
    }
    //注入每页的行数
    public void setLinePerPage(int linePerPage) {
        this.linePerPage = linePerPage;
    }

    @Override
    public void putInChar(char c) {
        content+=c;
        ++posX;
        //判断是否换行
        if(posX==charPerLine){
            content+=Paper.newline;
            posX=0;
            ++posY;
        }
        //判断是否翻页
        if(posY==linePerPage){
            content +="==第"+posP+"页==";
            content +=Paper.newline;
            posY=0;
            ++posP;
        }
    }

    @Override
    public String getContent() {
        String ret=this.content;
        //补齐本页空行，并显示页码
        if(!(posX==0&&posY==0)){
            int count=linePerPage-posY;
            for (int i = 0; i <count; ++i) {
                ret+=Paper.newline;
            }
            ret+="==第"+posP+"页++";
        }
        return ret;
    }
}
